1390256242 has 8 divisors (see below), whose sum is σ = 2086207596. Its totient is φ = 694853712.

The previous prime is 1390256227. The next prime is 1390256251. The reversal of 1390256242 is 2426520931.

It can be written as a sum of positive squares in 2 ways, for example, as 1228432401 + 161823841 = 35049^2 + 12721^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1390256198 and 1390256207.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130813 + ... + 141040.

Almost surely, 2^1390256242 is an apocalyptic number.

1390256242 is a deficient number, since it is larger than the sum of its proper divisors (695951354).

1390256242 is a wasteful number, since it uses less digits than its factorization.

1390256242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274412.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 1390256242 is about 37286.1400791232. The cubic root of 1390256242 is about 1116.0876038723.

The spelling of 1390256242 in words is "one billion, three hundred ninety million, two hundred fifty-six thousand, two hundred forty-two".